Resistance



/NVENTo/e W "@794 l M RESI STANCE M. W. WEISCOPF Filed Dec.

March 5, 1935.

ff f i, /5 /5 61K 1 Troie/VE y Patented Mu. s, 193s 1,993,496

j UNITED STATES PATENT OFFICE RESISTANCE Marcus W. Weiscopf, Philadelphia, Pa., assignor to International Resistance Company of Philadelphia, Pa., a corporation of Delaware Application December 26, 1930, Serial No. 504,847 12 claims. (c1. zur-63) The invention relates to, resistors and mounta rod or bar of porcelain or other insulating subings therefor. stance 11 having a capillary passage 12 through One of the objects of the invention is to prog which extends a resistance conductor 13 emvide a mounting for a plurality of resistors so bedded in metal end pieces 14, 14. The resistconstituted that any resistormay be readily reance conductor 13 preferably comprises a glass moved and replaced with a different resistor. rod or filament covered with a conductive coat- Another object of the invention is to provide a ing of highresistance material, such as carbon. mounting for a resistor by means of which it The conductor 13 is in intimate contact with may be readily attached to one or more other the wall of the capillary passage 12, the diameter resistors. Another object of thel invention of the conductor being preferably as near to the 10 is to provide Ia mountingv for resistors wherediameter of the capillary passage 12 as is pracby resistors of varying sizes and characteristicable. The porcelain insulatorgll is a good tics may be readily connected together in gang dielectric, so that there is no leakage of current formation. Another object of the invention through it, but as it readily conducts heat, any

15 is to provide a mounting for resistors which heat generated by the. resistance element 13 is 15 is durable and which may be manufactured at quickly dissipated. low cost. Another object of the invention is to The metal end pieces 14, 14 are rigidly conprovide a method of mounting a resistor which nected to the porcelain insulator rod 11. This is simple and very practical. Other objects will may be done by relating the rod andthe probe in part obvious or in part pointed out herejecting ends of the resistance conductor 13, 2o inafter. which is supported by the rod 11, to a suitable The invention accordingly consists in the feamold and molding the metal end pieces 14. 14 on tures of construction, combinations of elements, said insulator rod 11, thereby -completely emarrangements of parts and in the several steps bedding the resistance conductor 13, as is clearly and relation and order of each of said steps to shown in Figure 2. Preferably the metal end g5 one or more of the others thereof, all as will pieces 14, y14 are of .readily moldable metal, such be illustrativelyI described herein, and the scope as type metal, which in cooling expands in the of the application of which will be indicated mold and rmly grips the ends of the porcein the following claims. lain rod 11 so as to form a firm and rigid body.

In referring to the drawing, the terms plan, Referring more particularly to Figures 1, 2 30 side, underside, and the like, are used simand 3, firmly embedded in each molded metal ply to facilitate the description, as the resistor end piece 14 is a conductor 15 which desirably gang of theiinvention may be attached to any is a flexible metal wire. As shown in Figure 2, suitable apparatus in any desired position. In a substantial length of each conductor 15 is conthe accompanying drawing, in which is shown tained' in a metal end piece 14, the conductor 35 one of various possible embodiments of the being relatedto the mold at the time that the mechanical features of this invention. metal end pieces are molded to secure a perfect Figure 1 is a view of the underside of a single electrical and mechanical connection. The two resistor and its homingblock, conductors 15 of each resistor are electrically Figure 2 is a longitudinal sectional view of connected by the resistance conductor 13, and 40 the resistor and holding block taken on the line the union is noiseless in any audio circuit.

2-2 of Figure 1, Still referring to Figures 1, 2 and 3, on the Figure 3 is an isometric view of the resistor rod 11 between the molded end pieces 14, 14 and'holding block, is a holding block 16. In accordance with cer- Figure 4 is a plan of a gang of resistors and tain features of this invention the block 16 is 45 their holding blocks connected together, molded upon the rod 11 at the same time that 'Figure 5 is an underside view of the gang, and the metal end pieces 14, 14 are molded upon Figure 6 is a view partly in side elevation and the rod 11, a single mold being provided to form partly in section of the gang. the end pieces 14, 14 and the block 16, the cavi- 59 Similar reference characters refer to similar ties of the mold being joined by suitable gates. 50 parts throughout the several views of the The end pieces 14, 14 and the block 16 may drawing. be thus molded at a. single operation, thus re- Referring to all the figures, but more particducing the cost of manufacture of the unit of ularly to Figure 2, the resistor, indicated gen- Figures 1, 2 and 3 to a very low amount. As-

.5 erally by the numeral 10, preferably consists of suming that the molded end pieces 14, 14 were that so far as' certain features of this invention are concerned, the holding block 16 might be made in other ways, or molded of 'other material. v o

Referring more particularly to Figures 1 and 3, the holding block 16 has a pair of opposite sides 17 and 18 which are in planes parallel to each other and to the axis of the resistor 10. In one of these sides, for example in the side 17, and preferably substantially above the axis of the resistor 10, as is better shown in Figure 3, is an indenture 19. As is better shown in Figure 1, in the side 18 andopposite the in'- denture 19 is a tenon 20. The tenon 20 is com plementary to the indenture 19' and, as shown,

both the tenon and the indenture are hemis-I pherical in shape.

Still referring to Figures 1 and 3, extending away from the body of the holding block 16 are a pair of parallel legs 21, 21 which define between them a space 22 through which may extend a member parallel to the resistor 10. The legs 21, 21 together with the body of the block 16 make the complete holding block 16 U-shaped. The holding block 16 has a hole 23 through it in which is contained the porcelain insulator rod 11, and the axis of the hole 23 is perpendicular to the planev of the sides of the space 22.

Referring now to Figures 4, 5 and 6, any desired number of holding blocks 16 may be.

readily joined together. As shown in these figures, the flat side 17 of one holding block abuts the at side 18 of the next holding block,

and the tenon 20 of one holding block ts in the indenture 19 of the adjacent holding block.

Owing to the relationship between the sides 17 and 18 of the several holding blocks 16, the axes of the several holes 23 in the several holding blocks 16 are in parallel planes, while the intertting of the tenons 20 and indentures 19 causes alignment of the several holding blocks 16 along the axes of the indentures and-tenons 19 and 20.

Referring now particularly to Figures 5 and 6, a rod 25 is located in the space 22 between the legs 21, 21 of the several 4holding blocks 16,

thus aligning all the right-hand legs and vall the left-hand legs respectively of the several holding blocks 1 6. The several spaces22 thus merge to form a channel, and preferably the rod 25 has a diameter substantially the same as the width of this channel so that lateral movement of one holding block with respect to another is prevented. 'Ihe rod 25 is threaded at each end and nuts 26, 26 are provided to force the several holding blocks 16 together, thus forming a compact and rigid device. Y In Figure 6 several of the holding blocks are shown in section to show the interlocking of the tenons 20 and indentures 19, and the tenons and indentures effectively prevent sliding movement of one holding block 16 with respect"to another, while the rod 25 and the nuts 26 hold the holdof the fact that it is in substantial contact with veach leg 21 of every holding block 16, prevents torsional movement of the entire unit. For the purpose of attaching the assembled unit in any desired apparatus, L-shaped brackets 27, 27 are desirably provided, each bracket having a hole 28 through which the rod 25 passes, and a hole 29 for the passage of an attaching screw, or the like.

Referring now particularly to Figures 4 and 6, with the holding'blocks 16 fastened togetherl as described, the axes of the several resistors are parallel. The length of each holding block 16 (and by\length is meant that dimension perpendicular to the axis of the resistor 10 and parallel to the rod 25) is greater than the diameter of the metal end pieces 14, 14 by a substantial amount, so that the metal end pieces 14 of successive resistors 10 do not touch each other.

Referring now particularly to Figure 4, some of the holding blocks 16 contain resistors 10 of the general dimensions shown in Figures 1, 2 and 3, but there is also shown in this figure a resistor 10a whose insulator rod 11a is of larger diameter than an insulator rod 11. In Figure 4 is also shown a resistor 10b whose insulator rod 11b is of smaller diameter than a rod 11. A given gang assembly of resistors may include resistances 13 of greatly differing resistance values, and likewise it may be desirable to include in a given gang resistors of widely different current capacities. As resistors of large current capacity require insulator rods of large diameter, it is highly desirable to be able to join together in a gang resistors of different sizes. 'I'he length of the blocks 16 is greater than the diameter of the metal end pieces 14a, 14a on the ends of the insulator rods 11a, 11a

of the large sized resistors 10a, and thus there a particular resistor, the gang may be readily dissasembled-by removing the nuts 26, and the old resistor 10, with its holding block 16, replaced by a different one. 'Ihe ease with which a particular unit in the gang may be replaced, coupled with the rigidity of the unit when assembled, is a very important feature of the invention. There is practically no stress upon the individual holding block 16 except a compressive force, and so there is no tendency of a resistor 10 to turn or move endwise in the hole 23.' l

By the method of manufacture described, resistors andtheir holding blocks 16 cost very little more than resistors alone, and since the remaining parts of a gang may be made at very small cost, an entire gang of resistors costs little more than the resistors themselves. At the same time the gang as such is very durable and may be composed of any number of resistors desired, simply by providing a longer or shorter rod 25.

It will thus be seen that there has been provided by this invention a method and apparatus in which the various objects hereinabove set forth, together with many thoroughly practical advantages, are successfully achieved.

As various possible embodiments might be made of the mechanical features of the above invention and as the art herein/described might be varied in various parts, all without departing from the scope of the invention, it is to be understood that all matter herein set forth.,v or

shown in the accompanying drawing, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In apparatus of the class described, the combination with a plurality of resistors each of which comprises an elongated body of insulating material, a resistance conductor in said body, molded metal end caps on the ends o said body, vand conductors embedded in said molded metal end caps, of an individual holding block of the same metal as said end caps for Veach resistor molded on the elongated body and having a pair of spaced legs, a tenori, and an indenture, a rod iitting between the several pairs of legs, one or more nuts on the ends of said rod, and holding brackets secured to the apparatus by said rod.

2. A resistor gang construction comprising al plurality of resistors, individual holding means for each resistor comprising a member permanently amxed to such resistor and contacting no otherA resistor, a pair of projecting portions formed on each individual holding means, a connecting member tting between said several pairs of projecting portions to hold said several holding means together, and aligning means to align said individual holding means.

3. A resistor gang construction comprising a plurality of resistors, individual holdingmeans for each resistor comprising a member permanently aiiixed to such resistor and contacting no other resistor, a pair of projecting portions formed on each individual holding means, and a connecting member fitting between said several pairs of projecting portions to hold said several holding means together.

4. A resistor gang construction comprising a plurality of resistors having elongated body portions, individual holding means for holding each resistor at an intermediate point on the body portion, means to hold together said several holding means, and interlocking means to prevent relative lateral or torsional movement of the several individual holding means.

5. A resistor gang construction'comprising a 'plurality of resistors having elongated body portions, individual holding means for holding each resistor at an intermediate point on the body portion, and means to hold together said several holding means.

6. A resistor gang construction comprising a plurality of rod-like resistors, a separate holding member for Veach resistor having a pair of projecting portions extending away from the resistors each holding member being formed to hold its resistor by at least partial circumferential contact therewith, and a rod fitting between said several pairs o1 projecting portions to hold said holding members and therefore said resistors together.,

7. A resistor gang construction comprising a plurality of rod-like resistors, a separate holding member for each resistor each holding member being formed to hold its resistor by at least partial circumferential contact therewith, and a rod connecting said holding members together.

A resistor gang construction comprising a plurality or rod-like non-inductive resistors, a separate individually gripping holding member for each resistor comprising a member permanently aixed to such resistor and contacting no other resistor, and tenon and indenture means provided by said holding members.

9. A resistor unit comprising an elongated resistor body, a U-shaped member gripping said body, a tenon at one end of said member, and an indenture at the other end of said member, the plane of uthe U being parallel to the elongated body, and the legs of the U being perpendicular to the elongated body.

l0. A holding block for a resistor comprising a member having a pair of legs between which is adapted to be received a member to hold said block, said block having a transverse aperture to receive a resistor, i. e. the aperture for the resistor being transverse to the member which holds the blocks together, a tenon at one end of said block, and an indenture at the other end of said block.

11. A holding block for a resistor comprising a member having a pair of legs between which is adapted to be received a member to hold said block, said block having aitransverse aperture to receive a resistor, i. e. the aperture for the resistor being transverse to the member which holds the block.

12. A resistor unit comprising an elongated body of insulating material, a resistance conductor in said body, molded metal end caps on the ends of said body, and a molded block embedding and gripping said body between said end caps, said block dening an aperture for the reception of a member to hold a plurality of the units together, the axis of said aperture being substantially at right angles to the longitudinal axis of said body.

MARCUS W. WEISCOPF. 

